Method of making incandescent lamps



0. v. MAUBER. METHOD OF MAKING INCANDESCENT LAMPS. APPLICATION FILED APR-23,1919.

1,398,033. Patented Nov. 22, 1921.

tional side elevation ofthe lamp,

UNITED STATES PATENT.- OFFICE.

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Specification of Letters Patent.

Patented Nov. 22, 1921.

Application filed April 23, 191 Serial at. 292,011.

lamps, particularly small lamps, such as are 2 used for flash lights, automobile use, etc. The object is to provide for efiiciently making a tipless lamp; also to simplify and cheapen the operation of making the lamp and at the same time provide for accurately positioning the filament and effectively sealin the mount to the lobe.

o the above en s I provide a globe formed with a cylindrical neck or extension tube of such size that the mount with the filament may be slid into place through this tube. When in place the mount is suitably held by means extending through the tube, and an external heat is applied to the tube adjacent to the globe, and the tube and mount are pinched and effectively sealed together. During this pinching operation a passageway is mamtained in the mount for subsequent exhaustion. After sealing the mount in place in the extension tube the lamp is exhausted throu h the same tube;

In the drawings whic illustrate my invention, Figure 1 is a side elevation of a globe with the neck or extension tube as blown; Fig. 2 is a side elevation of a mount and filament adapted for insertion through the neck of the globe shown in Fig. 1; Fig. is a sectional side elevation of the globe after the mount has been placed therein and before exhaustion is effected; Fig. 4 is, a sectional side elevation of the lamfi after exhaustion and ready for the app 'cation of the base; Fig. 5 1s a side elevation of a mount of somewhat different form and a supporting rod therefor; Fig. 6 is a secglobe and neck with the filament and mount in place, being held by the rod; Fig. 7 is a sectional side elevation of the same lamp after exhaustion and before thebase is applied. Fig. 8 is a fragmentary sectional view of a lamp-globe and neck prior to sealing wlth a slightly different form of mounting for the filament and lead wires, held therein. Fig.

tube sea ed 9 is a sectional view of the form shown in Fig. 8 after the lamp has been sealed off.

s shown In Figs. 1, 3 and 6, 10 indicates the globe proper and-11 the c lindrical neck or extension tube thereof. This structure is readily made in any suitable glass blowing aiiparatus. In Fig. 2, 2O indlcates a disk- 1 e plu or base of the mount, 22 a metal therein, 23 a glass bead carried thereon, 24 the filament and 25 leading wires base 20 and complete independently of the globe and a erward mounted therein.

The base 20 of the mount is of such diameter that it may readily slide within the tube 11, making a sliding fit therewith. A suitable holder, as for instance a rod 21, engagmg the tube 22 enables the mount to shoved 1nto place through the tube and held within the tube adjacent to its junction with the globe; that is, the position shown in F g. 3. 'lVhen the' parts are in this tlon the extension tube 11 is heated in a zone surrounding the mount base 20 and then the tube is pinched onto the base 20 to make a rigid junction therewith. During this oneratlon the tube may be brought in beyond the mount, as indicated by the broken lines 12 in F1g.'3, this contraction simplifying the sealing off after the exhaustion.

globe exhausted through it. During such process the metal supporting tube 22 of the mount permits the exhaustion of air from the interior. When the exhaustion is completed the tube is sealed off at the point 13 in Fig. 4, the discarded portion of the tube being indicated in broken lines in this figure.

Figs. 5, 6 and 7 illustrate a method of making the lamp without employing the metal tube 22 forming a permanent part of the mount. In this case the mount 27 is formed with a central hole into which extends a rod or tube 30 of metal or other material adapted to be withdrawn. The mount carries the leading wires 25 which may have the bracing them. vThe complete mount carried by the rod or tube 30 is inserted in the glass tube 11 and positioned as shown in Fig. 6; then the glass tube is heated in a zone outside the mount base and the tube'is pinched onto the head 28 supported by moiint effectively sealing it, the inserted rod or tube preventing the closing of the opening. At the time of pinching, the glass tube may be contracted as indicated at 12 in Fig. 6, if desired. During this heating and inching operation the tube or rod 30 may, if desired, be rotated in the mount base to revent its adhering. After this mount has been sealed in the globe the tube or rod 30 is withdrawn, leaving the mount base with a central passageway 29 for exhaustion. The globe is then exhausted through the tube 11 and the tube sealed offat the point 13 at the completion of the exhaustion.

In some cases it is desirable to omit the base 20 or 27 of the mount and pinch the neck of the globe directly onto the leading wires and onto the tube 22, if the same be employed. In such case the mount (whether it consists simply of the lead wires and filament or these with other parts) is temporarily held in position by means 21 extending out of the tube 11 as already explained, the supporting means being withdrawn after the sealing of the neck to the mount has been effected. Such a form is illustrated in Figs. 8 and 9.

It will be seen that whether the lamp is of the form shown in Fig. 4-, or that shown in Fig. 7, or that shown in Figs. 8 and 9 the mount is efi'ectively pinched and sealed within the tube 11, while an exhausting passageway is maintained at the base. The manufacturing 0 erations are very simple and may be cheap y performed. The mount is not only effectively sealed in place, but is accurately positioned with reference to the globe, during the operation of sealing it in place. While the method. described is believed to be suitable for making lamps of the size shown in the drawings hereof, it is to be understood that; it may be used in the manufacture of lamps of very much smaller size and it is in such small sizes that principal difficulties have heretofore occurred in pro erly placing and holding the filament.

aving thus described my invention, what I claim is:

1. The method of making incandescent lamps, comprising taking a globe with an elongated tubular neck, and a mount having spaced leading wires and a filament connected therewith, putting the mount in place through the neck, heating and pinching the neck onto the mount while maintaining an exhausting passageway throu h the neck, and thereafter exhausting theglobe and sealing the neck closed about said mount.

2. The method of making incandescent lamps, comprising taking a filament mount havin leading wires in spaced position withass bead, and a globe having an el0n-' in a gate? cylindrical neck, inserting the mount into said neck, heating azone of the neck and pinching it around the mount while maintaining an openin [in communication with the atmosphere within and outside of,

said globe, and thereafter exhausting the globe through the neck and sealing the neck closed below such pinched zone.

3. The method of making incandescent lamps, consisting of taking a globe having a cylindrical tube forming an extension of the body of the globe, taking a mount having a glass disk through which the lead Wires extend and having a central opening through it, inserting such mount into the tube, the exterior dimensions of the mount with its lead wires and filament being less than the interior diameter of the tube, heating the exterior of the tube adjacent to the disk and pinching it onto the disk while preventing the openin through the disk being closed, and thereafter exhausting the lamp through the end of said cylindrical tube remote from the globe and then sealing off such cylindrical tube beyond the mount.

4. The method of making incandescent.

taking a globe electric lamps comprising having a cylindrical tube formed as part of it and extending from it and in open com munication with it, forming a mount with leading wires and filament carried by the leading wires, the external dimension of the mount being smaller than the internal diameter of the tube inserting the mount by external means projecting therethrough, into the tube, then heating the tube and pinching it onto the mount while preventing a central opening therein from collapsing, then withdrawing the holding device, exhausting the globe through the open end of the tube, and sealing off such tube beyond the base of the mount. I

5. The method of making incandescent electric lamps comprising taking a globe havin a cylindrical tube formed as part of it an munication with it, forming a mount with a glass disk as its base and leadin extending through such disk and a carried by the leadin wires, the external diameter of the glass disk being only slightly smaller than the internal diameter of the tube, and the filament being small enough to pass through such tube, the disk having a central hole through 1t, inserting means carrying the mount the tube with the disk positioned in the tube adjacent to the globe, then heating the tube and pinchin it onto the mount while externally hol ing the mount and while preventing collapsing, then withdrawingthe holding device, and then exhausing the globe through the same tube and sealing 01f such tube beyond the base of the mount. y

6. The method of making incandescent lamps, consisting of takin a filament mount having a 7 glass head, w th leading wires wires from the exterior into.

extending from it and in open comlament A the central opening therein from a sealed therein, and a filament connected to mount while maintaining an exhausing passaid wires, takin a globe having an elonsa eway through the neck, and thereafter gated neck of su stantially uniform diamexhausting the globe through such passage- 10 eter throughout its length, inserting the we and sealing the neck closed.

5 mount through said neck partially into said I h testimony whereof, I hereunto aflix my globe, heating a zone of the neck adjacent signature. to the globe and pinching it around the OSCAR V. MAURER. 

